// ParsePathString parses a string and returns a path
func ParsePathString(s string) ([]*Path, error) {
paths := make([]*Path, 0, 0)
currentPath := new(Path)
currentPath.Color = color.RGBA{0xff, 0, 0, 0xff}
currentPath.Weight = 5.0
for _, ss := range strings.Split(s, "|") {
if ok, suffix := hasPrefix(ss, "color:"); ok {
var err error
if currentPath.Color, err = ParseColorString(suffix); err != nil {
return nil, err
}
} else if ok, suffix := hasPrefix(ss, "weight:"); ok {
var err error
if currentPath.Weight, err = strconv.ParseFloat(suffix, 64); err != nil {
return nil, err
}
} else if ok, suffix := hasPrefix(ss, "gpx:"); ok {
gpxData, err := gpx.ParseFile(suffix)
if err != nil {
return nil, err
}
for _, trk := range gpxData.Tracks {
for _, seg := range trk.Segments {
p := new(Path)
p.Color = currentPath.Color
p.Weight = currentPath.Weight
for _, pt := range seg.Points {
p.Positions = append(p.Positions, s2.LatLngFromDegrees(pt.GetLatitude(), pt.GetLongitude()))
}
if len(p.Positions) > 0 {
paths = append(paths, p)
}
}
}
} else {
lat, lng, err := coordsparser.Parse(ss)
if err != nil {
return nil, err
}
currentPath.Positions = append(currentPath.Positions, s2.LatLngFromDegrees(lat, lng))
}
}
if len(currentPath.Positions) > 0 {
paths = append(paths, currentPath)
}
return paths, nil
}
// ParseMarkerString parses a string and returns an array of markers
func ParseMarkerString(s string) ([]*Marker, error) {
markers := make([]*Marker, 0, 0)
var color color.Color = color.RGBA{0xff, 0, 0, 0xff}
size := 16.0
label := ""
for _, ss := range strings.Split(s, "|") {
if ok, suffix := hasPrefix(ss, "color:"); ok {
var err error
color, err = ParseColorString(suffix)
if err != nil {
return nil, err
}
} else if ok, suffix := hasPrefix(ss, "label:"); ok {
label = suffix
} else if ok, suffix := hasPrefix(ss, "size:"); ok {
var err error
size, err = parseSizeString(suffix)
if err != nil {
return nil, err
}
} else {
lat, lng, err := coordsparser.Parse(ss)
if err != nil {
return nil, err
}
m := NewMarker(s2.LatLngFromDegrees(lat, lng), color, size)
m.Label = label
markers = append(markers, m)
}
}
return markers, nil
}
// create cells for point from the minLevel to maxLevel both inclusive.
func indexCellsForPoint(p *geom.Point, minLevel, maxLevel int) (s2.CellUnion, s2.CellUnion) {
if maxLevel < minLevel {
log.Fatalf("Maxlevel should be greater than minLevel")
}
ll := s2.LatLngFromDegrees(p.Y(), p.X())
c := s2.CellIDFromLatLng(ll)
cells := make([]s2.CellID, maxLevel-minLevel+1)
for l := minLevel; l <= maxLevel; l++ {
cells[l-minLevel] = c.Parent(l)
}
return cells, []s2.CellID{c.Parent(maxLevel)}
}
// ParseAreaString parses a string and returns an area
func ParseAreaString(s string) (*Area, error) {
area := new(Area)
area.Color = color.RGBA{0xff, 0, 0, 0xff}
area.Fill = color.Transparent
area.Weight = 5.0
for _, ss := range strings.Split(s, "|") {
if ok, suffix := hasPrefix(ss, "color:"); ok {
var err error
area.Color, err = ParseColorString(suffix)
if err != nil {
return nil, err
}
} else if ok, suffix := hasPrefix(ss, "fill:"); ok {
var err error
area.Fill, err = ParseColorString(suffix)
if err != nil {
return nil, err
}
} else if ok, suffix := hasPrefix(ss, "weight:"); ok {
var err error
area.Weight, err = strconv.ParseFloat(suffix, 64)
if err != nil {
return nil, err
}
} else {
lat, lng, err := coordsparser.Parse(ss)
if err != nil {
return nil, err
}
area.Positions = append(area.Positions, s2.LatLngFromDegrees(lat, lng))
}
}
return area, nil
}
func pointFromCoord(r geom.Coord) s2.Point {
// The geojson spec says that coordinates are specified as [long, lat]
// We assume that any data encoded in the database follows that format.
ll := s2.LatLngFromDegrees(r.Y(), r.X())
return s2.PointFromLatLng(ll)
}
func main() {
var opts struct {
// ClearCache bool `long:"clear-cache" description:"Clears the tile cache"`
Width int `long:"width" description:"Width of the generated static map image" value-name:"PIXELS" default:"512"`
Height int `long:"height" description:"Height of the generated static map image" value-name:"PIXELS" default:"512"`
Output string `short:"o" long:"output" description:"Output file name" value-name:"FILENAME" default:"map.png"`
Type string `short:"t" long:"type" description:"Select the map type; list possible map types with '--type list'" value-name:"MAPTYPE"`
Center string `short:"c" long:"center" description:"Center coordinates (lat,lng) of the static map" value-name:"LATLNG"`
Zoom int `short:"z" long:"zoom" description:"Zoom factor" value-name:"ZOOMLEVEL"`
Markers []string `short:"m" long:"marker" description:"Add a marker to the static map" value-name:"MARKER"`
Paths []string `short:"p" long:"path" description:"Add a path to the static map" value-name:"PATH"`
Areas []string `short:"a" long:"area" description:"Add an area to the static map" value-name:"AREA"`
}
parser := flags.NewParser(&opts, flags.HelpFlag|flags.PassDoubleDash)
parser.LongDescription = `Creates a static map`
_, err := parser.Parse()
if parser.FindOptionByLongName("help").IsSet() {
parser.WriteHelp(os.Stdout)
os.Exit(0)
}
ctx := sm.NewContext()
if parser.FindOptionByLongName("type").IsSet() {
tp := getTileProviderOrExit(opts.Type)
if tp != nil {
ctx.SetTileProvider(tp)
}
}
ctx.SetSize(opts.Width, opts.Height)
if parser.FindOptionByLongName("zoom").IsSet() {
ctx.SetZoom(opts.Zoom)
}
if parser.FindOptionByLongName("center").IsSet() {
lat, lng, err := coordsparser.Parse(opts.Center)
if err != nil {
log.Fatal(err)
} else {
ctx.SetCenter(s2.LatLngFromDegrees(lat, lng))
}
}
for _, markerString := range opts.Markers {
markers, err := sm.ParseMarkerString(markerString)
if err != nil {
log.Fatal(err)
} else {
for _, marker := range markers {
ctx.AddMarker(marker)
}
}
}
for _, pathString := range opts.Paths {
paths, err := sm.ParsePathString(pathString)
if err != nil {
log.Fatal(err)
} else {
for _, path := range paths {
ctx.AddPath(path)
}
}
}
for _, areaString := range opts.Areas {
area, err := sm.ParseAreaString(areaString)
if err != nil {
log.Fatal(err)
} else {
ctx.AddArea(area)
}
}
img, err := ctx.Render()
if err != nil {
log.Fatal(err)
return
}
if err = gg.SavePNG(opts.Output, img); err != nil {
log.Fatal(err)
return
}
}